GS Biology Questions and Answers

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Q201
Pasteur succeeded in disproving the spontaneous generation theory because
  • A he was lucky
  • B he ingeniously designed flasks that allowed air but not microorganisms
  • C sample yeast was dead
  • D the laboratory was very clean
Answer: Option B
Explanation: Pasteur’s experimental flask design prevented microbial contamination proving spontaneous generation false.
Q202
The first organisms were
  • A primitive eukaryotes
  • B aerobic bacteria
  • C prokaryotic
  • D photosynthetic
Answer: Option C
Explanation: The earliest life forms were prokaryotic organisms lacking a nucleus.
Q203
Why was the primitive atmosphere of Earth more beneficial to the origin of life than the modern atmosphere?
  • A It had an ozone layer protecting cells
  • B It was reducing, facilitating complex molecule formation
  • C It was oxidizing, facilitating complex molecule formation
  • D It had less free energy, protecting organisms
Answer: Option B
Explanation: A reducing atmosphere allowed chemical reactions necessary for life to occur.
Q204
Russian scientist who proposed the theory of origin of life was
  • A Oparin
  • B Miller
  • C Haldane
  • D Fox
Answer: Option A
Explanation: Oparin proposed theories on the chemical origins of life on Earth.
Q205
In laboratory simulation of early Earth, Miller and Urey observed abiotic synthesis of
  • A amino acids
  • B coacervates
  • C DNA
  • D liposomes
Answer: Option A
Explanation: Miller and Urey demonstrated abiotic synthesis of amino acids, essential for life.
Q206
The richest source of fossils is
  • A basalt
  • B granite
  • C lava
  • D sedimentary rock
Answer: Option D
Explanation: Sedimentary rocks commonly contain fossils due to their formation from sediment deposits.
Q207
Biologists who study the sequences of organisms in the fossil record are
  • A taxonomists
  • B palaeobiologists
  • C misologists
  • D systematists
Answer: Option B
Explanation: Palaeobiologists analyze fossils to study the history of life.
Q208
Which were dominant in Mesozoic?
  • A Dinosaurs
  • B Gymnosperms
  • C Fishes
  • D Mammals
Answer: Option A
Explanation: Dinosaurs were the dominant terrestrial vertebrates during the Mesozoic era.
Q209
The "Golden age of Reptiles" was
  • A Late Paleozoic
  • B Cenozoic
  • C Mesozoic
  • D Proterozoic
Answer: Option C
Explanation: The Mesozoic era is known as the Golden age of reptiles, especially dinosaurs.
Q210
The fossil remains of Archaeopteryx is a connecting link between
  • A amphibians
  • B reptiles and birds
  • C fish and amphibians
  • D reptiles and mammals
Answer: Option B
Explanation: Archaeopteryx shows characteristics of both reptiles and birds, important in evolution.

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